Originally posted by SirCoxone
I found this amazing image of such clouds over Everest, check out the pic. It's awesome.
Originally posted by czygyny
reply to post by SirCoxone
That is about the most amazing example of iridescence I've ever seen. Tiny, evenly sized water droplets are creating that phenomenon rather than the ice crystals of the circumhorizon arc.
Originally posted by Truth4Thought
reply to post by MadMaxZombie
Hey OP awesome pictures you have there, star and flag for you!
I have never seen anything like those rainbow trails you posted. Those are clearly not your regular contrail. Anyone who tries and tells you different has their heads buried in the sand.
Originally posted by stars15k
And for all the people bored with the mumbo-jumbo of science, think a visible spectrum can be created by metals and not by water in any form, think it is poisoning the world, have only seen colors in the sky since 1990's sometime, please consider this:
On the Cause of Iridescence in Clouds
Colors have been seen in clouds since there were first people to see clouds. There are many different reasons and the absolute best explanation of all of them is at the site already shared, Atmospheric Optics. Irridescence is just one of them. So why am I including this particular article?
It was published in 1887, when Orville and Wilbur Wright were 6 and 10 years old. Long before airplanes were able to fly high enough to create a trail, because it was long before airplanes.
Let us now explain the nature and cause of halo, rainbow, mock suns,
and rods, since the same account applies to them all.
We must first describe the phenomena and the circumstances in which
each of them occurs. The halo often appears as a complete circle:
it is seen round the sun and the moon and bright stars, by night as
well as by day, and at midday or in the afternoon, more rarely about
sunrise or sunset.
The rainbow never forms a full circle, nor any segment greater than
a semicircle. At sunset and sunrise the circle is smallest and the
segment largest: as the sun rises higher the circle is larger and
the segment smaller. After the autumn equinox in the shorter days
it is seen at every hour of the day, in the summer not about midday.
There are never more than two rainbows at one time. Each of them is
three-coloured; the colours are the same in both and their number
is the same, but in the outer rainbow they are fainter and their position
is reversed. In the inner rainbow the first and largest band is red;
in the outer rainbow the band that is nearest to this one and smallest
is of the same colour: the other bands correspond on the same principle.
These are almost the only colours which painters cannot manufacture:
for there are colours which they create by mixing, but no mixing will
give red, green, or purple. These are the colours of the rainbow,
though between the red and the green an orange colour is often seen.
Mock suns and rods are always seen by the side of the sun, not above
or below it nor in the opposite quarter of the sky. They are not seen
at night but always in the neighbourhood of the sun, either as it
is rising or setting but more commonly towards sunset. They have scarcely
ever appeared when the sun was on the meridian, though this once happened
in Bosporus where two mock suns rose with the sun and followed it
all through the day till sunset.
[Light] is reflected in this way when air and vapour are condensed into
a cloud and the condensed matter is uniform and consists of small
Originally posted by Uncinus
Not exactly evenly sized, more like "similarly sized, with graduated variation".
If all the drops are the same size, they you'd just get curved spectrum, based on the angle from the sun (arcs and halos). Here (the Everest photo), the colors vary based on the size of the ice particles, with the smaller particles at the edges of the cloud. see this short yet technical explanation: